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FROM COMPRESSOR PRESSURE RELIEF DEVICE The installing contractor must take all precautions necessary to RESERVOIR FITTING AIR SUPPLY VALVE protect employees working in or near a tank excavation.These AIR SUPPLY GAUGE precautions should include,but are not limited to: SERVICE FITTING •Location and protection of any utility installations near the excavation before opening the excavation; •Means of securing the walls of the excavation; 613 -Means of preventing exposure of employees to hazardous fumes from the excavation; -Protection of employees from hazards associated with water FIGURE 2-4 accumulation in the excavation; -Barricades,etc.to prevent unauthorized vehicle or pedestrian traffic; SECONDARY(EXTERNAL)-TANK TEST •Inspection of the excavation and surrounding area at least daily. CAUTION:Do not pressurize the secondary tank(interstitial space) For additional information on excavation,trenchin and shorin or the primary tank may rupture and cause tank failure. 9 9 safety practices,consult OSHA's Construction Industry Standards Check the exterior of the tank for monitoring liquid—if liquid is Part 1926,Subpart P. found,wipe the tank dry and verify that the liquid does not The minimum depth of the excavation is normally determined by reappear.Lift the tank to check the bottom.Do not roll the tank. the presence or absence of groundwater and the presence or DANGER:Do not stand under the tank while it is being lifted. absence of traffic at the site.These dimensions are critical to the When the test is complete,remove the test manifold.Usually successful installation of a tank and are often regulated by code. check the interior of the tank for liquid.Replace the protective Refer to: covers in the service fitting and the reservoir fitting. •federal,state and local codes •NFPA 30&API 1615 Xerxes tanks must be installed using either pea gravel or crushed. -the figures below stone which meets the following specifications. NOTE.Numbers in brackets[l 9' ° ° s" GENERAL:The material is washed and free flowing and conformreferto 12'tanks.s .. .. ..... ... ... . to the specification of ASTM C-33 para.91,sizes 6 through 8.No more than 5%®(by weight)of the material may pass through a#8 '®- [fe, 36 sieve.it is recommended that the supplier certify that the material - CONDITIONS conforms to ASTM C-33 and any other applicable specifications. (For additional information,refer to the Xerxes pamphlet Fiberglass TRAFFIC Tank Backfill Guidelines.) 3/4" 1/2" a Iz- 1/8" 1/8" Tanks subjected to traffic loads must have a cover depth of at least 18[36]inches of backfill plus 9 inches of asphalt.An acceptable alternative is a minimum of 18[36]inches of backfill plus 6 inches of reinforced concrete. C3 JS C131 oo k ° 6. PEA GRAVEL CRUSHED STONE 30' 30- [36- NET 36" CONDITIONS PEA GRAVEL:Mix of rounded particles—sizes between 1/8" and 3/4". TRAFFIC CRUSHED STONE:Mix of angular particles—sizes between 1/8" NOTE:Numbers in brackets[ and 1/2". refer to 12'tanks. iz- NOTE:If material which meets these specifications is not available,contact the Xerxes Technical Service Department for information on approved alternate materials and installation instructions.Using other than approved bedding and bade Tanks subjected to traffic loads and high water must have a fill materials without Xerxes'prior written approval will void the tank warranty and minimum of 30[36]inches of backfill and either 9 inches of may result in tank failure. asphalt or 6 inches of reinforced concrete.